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' Geola5u TecFinus Inc Page 4 <br /> Groundwater Momtonng Report <br /> Project No 770 2 <br /> Apn1 11,2001 <br /> f <br /> Groundwater monitoring field logs are included in Appendix C <br /> ' 1.3 Laboratory Analyses <br /> The groundwater samples collected on March 15, 2001 were delivered to Sherwood Lab <br /> (Department of Health Services Certification No 1400), of Hilmar, California, for analysis <br /> ' Sherwood analyzed the three monitoring well groundwater samples for <br /> • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX)by EPA method 602 <br /> ' • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) <br /> • TEPH- Diesel, Kerosene, Dielectric and Motor Oil by EPA method 3510/8015(M) <br /> ' The detection limits for the above analyses are listed in Table 2 of Appendix A while the lab <br /> analytical results are presented in Appendix B <br /> 2.0 FINDINGS AND DISCUSSION <br /> ' The results of the groundwater sample analysis indicate the following <br /> • Diesel range petroleum hydrocarbons have impacted the groundwater in five of the <br /> seven monitoring wells MW-2, MW-3, MW-4, and MW-5 <br /> • The field technician noted the presence of product sheen in well MW-5 <br /> • Minor BTEX constituents are present at levels ranging from <0 3 — 1 ug/l in wells MW- <br /> ' 4 and MW-6 <br /> • Gasoline, kerosene, and motor oil range petroleum hydrocarbons were not present in <br /> any of the groundwater samples at concentrations above the laboratory reporting limits <br /> ' • Deep well MW-105 was free of detectable contamination for the first time since its <br /> installation <br /> ' • GTI inadvertently failed to request Ethanol analyses for wells MW-5 and MW-105 to <br /> confirm the previous value in well MW-5 at 58,000 ug/l The analysis for ethanol will <br /> be included in the lune 2001 event <br /> ' The lateral extent of the diesel groundwater plume is currently undefined due to the changes <br /> in groundwater direction The vertical extent of the plume is currently defined by MW-105 <br /> ' It is noted that groundwater elevation has increased for two consecutive events at an <br /> average rate of I 1 feet per quarter The contaminant trends may be influenced by this <br /> factor but the concentrations have increased in well MW-5 while decreasing in well MW-4 <br /> ' (Iocated adjacent to the former UST excavation) <br /> 40 <br />